【摘要】 本文报道甘肃省环境天然贯穿辐射水平调查的方法和结果。全省以２５ｋｍ×２５ｋｍ网格均匀布点，共布设网格点６４７个，各类加密点３４６个。调查结果表明：（１）甘肃省原野γ辐射剂量率按面积、人口和网格点的加权均值分别为６２．９、６４．５和６２．６ｎＧｙ·ｈ－１；（２）道路γ辐射剂量率按网格点平均值为６０．８ｎＧｙ·ｈ－１；（３）室内γ辐射剂量率按人口和网格点加权均值分别为１０１．６和９９．２ｎＧｙ·ｈ－１；（４）宇宙射线电离成分（不包括中子）所致空气吸收剂量率按人口和网格点加权均值，室内分别为４３．３和４５．０ｎＧｙ·ｈ－１，室外分别为４９．４和４８．４ｎＧｙ·ｈ－１；（５）天然贯穿辐射剂量率，按人口和网格点加权均值，室内分别为１４５．０和１４４．１ｎＧｙ·ｈ－１，室外分别为１１３．４和１１３．１ｎＧｙ·ｈ－１；（６）天然γ辐射、宇宙射线和天然贯穿辐射所致居民人均年有效剂量当量分别为０．５６、０．３９和０．９５ｍＳｖ，所致全省居民集体年有效剂量当量分别为１．１×１０４、０．７７×１０４和１．８７×１０４人·Ｓｖ。更多还原

【Abstract】 The methods and results of the investigation on natUral penetrating radiation level in Gansu Province are presented. 647 25 km×25 km-grid measuring points were set uniformly up all over the province,with 346 densely measuring points of different types added. Theresults show that: (1)The area-weighted,population-weighted and point-weighted averagevalue of natural γradiation dose rate for field is 62. 9, 60. 5 and 62. 6 nGy·h-1,respectively;(2)The point-weighted average value of natural γradiaton dose rate for road is 60. 8 nGy·h-1 ;(3)The population-weighted average and point-weighted value of natural γradiaton doserate inside buildings is 101. 6 and 99. 2 nGy·h-1,respectively; (4)The population-weighted and point-weighted average value of the dose rate inside buildings from cosmic ray is 43. 3and 45. 0 nGy·h-1,and outside buildings is 49. 4 and 48. 4 nGy·h-1,respectively; (5)Thepoint-weighted and population-weighted average value of natural penetrating radiation doserate inside buildings is 145. 0 and 144. 1 nGy·h-1,outside buildings is 113. 4 and 113. 1 nGy·h-1,respectively; (6) The annual effective dose equivalent from natural γradiation,cosmicray and natural penetrating radiation is 0. 56, 0. 39 and 0. 96 mSv, respectivelys and correspendingly,the annual collective effective dose equivalent is 1. 1×104, 0. 77×104 and 1. 87 ×104 man. Sv,respectively.更多还原